Paper making and fiber liberation – Apparatus – Automatic control
Patent
1990-12-17
1991-12-10
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Automatic control
162263, 162DIG6, 162DIG11, 250571, 356429, D21F 106, D21F 700
Patent
active
050715143
ABSTRACT:
A paper weight sensor system is intended for use on a paper-making machine having a headbox with a slice-lip mounted thereon for forming a moving web of material. Plural slice-lip actuators are provided for setting the slice-lip gap to control the amount of material in the web and are mounted on the headbox. Plural stationary optical sensors are located at a first station and extend across the width of the web in a continuous array for detecting the transmissivity of the web in a one-to-one relationship with the slice-lip actuators at an aligned location downstream of each actuator. Each sensor includes plural light detectors therein which are operable to generate a first transmissivity signal representing the transmissivity of the web for discrete regions thereof adjacent each light detector corresponding to a given actuator. A calibration device is provided for sensing a selected web parameter for a discrete region of the web and is operable to generate a calibration signal indicative of the selected parameter. The system includes a computer which is operable to compare each transmissivity signal and a corresponding portion of the calibration signal for a discrete region of the web and to generate a control signal which is a function of the transmissivity signal as calibrated by the calibration signal. The computer is further operable to generate related actuator signals from the control signals for adjusting each slice-lip actuator.
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Francis Systems, Inc.
Hastings Karen M.
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